RFID is a low-power short-range wireless communication technology, which is called "RadioFrequency IdenTIficaTIon". The composition of an RFID system generally consists of at least two parts: an electronic tag (English name is Tag) and a reader/writer (English name is Reader/Writer or Interrogator). The electronic tag generally stores electronic data in an agreed format. In practical applications, the electronic tag is attached to the surface of the object to be identified. The reader can read and recognize the electronic data stored in the electronic tag without contact, thereby achieving the purpose of automatically recognizing the object. Further management functions such as collection, processing and remote transmission of object identification information are realized through a computer and a computer network.
RFID technology has several unusual engineering test challenges, such as transient signals, bandwidth inefficient modulation techniques, and backscatter data. Traditional swept-tuned spectrum analyzers, vector signal analyzers, and oscilloscopes have been used for the development of wireless data links. However, these tools have some drawbacks when used in RFID testing. Sweep-tuned spectrum analyzers are difficult to accurately capture and characterize transient RF signals. Vector signal analyzers do not actually support spectrum-efficient RFID modulation techniques and special decoding requirements. Fast oscilloscopes have a small measurement dynamic range and do not have modulation and decoding capabilities. The Real-Time Spectrum Analyzer RTSA (hereafter referred to as RTSA) overcomes the limitations of these traditional test tools and is optimized for transient signals. Tektronix' patented frequency mask triggers reliably trigger specific spectral events in complex real-world spectrum environments.
The testing of RFID signals covers the frequency domain, time domain and modulation domain analysis of RF signals. For chip and device development and manufacturing companies, it is necessary to test whether the product complies with radio regulations and industry standards. For system integrators, it is necessary to analyze the interoperability of RFID systems in the actual environment (such as analyzing the interference of readers, tags and the surrounding environment, optimizing the placement of reading and writing instruments, adding shielding materials, etc.). These requirements require the test instrument to have the following characteristics:
Standard compliance testThe signal is an intermittent signal, and the power is small, sometimes even a frequency hopping signal. The test instrument needs to capture the transient change signal, can seamlessly store the signal for a long time and play back the analysis, and has a faster test speed. Signals using a variety of different modulation methods require the test instrument to have digital modulation signal analysis. It is best to support a variety of RFID standards, not only to demodulate, but also to decode a wide variety of encodings to read data.
The coding of the signal specifies a lot of time parameters. The reader and tag transmission and response time parameters also need to be tested. The test instrument is required to have signal time domain analysis function, multi-domain correlation analysis capability and good time resolution. Many RFID systems use frequency hopping systems, and test instruments must have the ability to analyze frequency hopping signals. Limitations of using traditional instruments: Standard compliance testing of RFID products using traditional meters requires multiple devices, but many projects still do not perform well. For example, using a swept spectrum analyzer, it is difficult to capture the intermittent signal of the RFID, the modulation characteristics of the signal cannot be analyzed, and the time domain characteristics of a complete communication sequence cannot be analyzed. The use of vector signal analyzers, limited by limited triggering methods, makes finding RFID packets an extremely cumbersome operation, especially for carrier-transmitted RFID systems. With limited time-correlated multi-domains, it is difficult to observe modulation characteristics and frequencies. Characteristics of characteristics over time. With an oscilloscope, it has to face a poor dynamic range, extremely limited frequency domain functions, and cannot achieve difficulties such as modulation analysis.
Interoperability testing of RFID systemsWhen the RFID system is installed in the actual environment, it is often affected by various effects, such as the influence of the surrounding electromagnetic environment, multiple readers, mutual interference between multiple tags, interference between high and low frequency RFID systems, The RFID system is not working or the performance is degraded. In order to solve the above problems, you need to test.
The device has the following capabilities:
1 Real-time observation of readers and tags on all RFID channels.
2 Analyze the detailed communication between the tags such as carrier sense and transmission control of all channels and the reader.
3 It has high sensitivity, masters the reader signal in other areas and electromagnetic interference existing in the surrounding environment, and has the ability to capture steady-state interference signals and transient interference signals.
4 Capture the RFID signal in the actual environment and observe the modulation quality.
5 Limitations of traditional instruments:
The analysis of RFID signals and interference signals in real environments is a very difficult task for traditional equipment. When using a swept spectrum analyzer, it is impossible to observe the occurrence of each channel in real time, and it is impossible to find transient electromagnetic interference, and it is impossible to analyze the modulation quality. The use of vector signal analyzers does not have true real-time characteristics, and it is also impossible to observe and detect transient interference in real time.
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Guangzhou Chengwen Photoelectric Technology co.,ltd , https://www.cwledpanel.com